Sander device



May 12, 1970 v. K. MASON 3,510,988

SANDER DEVICE Filed Aug. 12, 1966 2 Sheets-Sheet 1 ATTORNEY May 12, 1970 v. K. MASON 0,

z SANDER DEVICE Filed Aug. 12, 1966 2 Sheets-Sheet 2 6b 59 3s v INVENTOR Vern K. Mason BY QM a KQQK ATTORNEY 3,510,988 Patented May 12, 1970 3,510,988 SANDER DEVICE Vern K. Mason, 2103 7th Ave. N., Grand Forks, N. Dak. 58201 Filed Aug. 12, 1966, Ser. No. 572,004 Int. Cl. B24b 21/00, 23/06, 25/00 US. Cl. 51--148 Claims ABSTRACT OF THE DISCLOSURE Sanding device having an L-shaped plate means having a. base leg and upright plate means, a motor mounted to the base leg of said plate means, a telescoping member slideably mounted to the upper portion of said plate means, a pulley rotatively mounted to the upper end of said telescoping member, a coil spring mounted between said upper portion of said upright leg means and said telescoping member and urging said telescoping member upward, said motor having a motor shaft passing through said upright plate means of said L-shaped plate means, a wheel mounted to said motor shaft, a sanding belt mounted over said pulley wheel, whereby upon powering said motor will rotate said sanding belt.

This invention relates to sanding equipment, more particularly the invention relates to belt sanding equipment.

It is an object of the invention to provide a novel belt sander which may be inexpensively made and easily carried from place to place.

It is a further object of this invention to provide a novel belt sander wherein the sanding belt may be rapidly removed and replaced.

It is another object of the invention to provide a novel belt sander which may be used for a variety of sanding operations.

Further objects and advantages of the invention will become apparent as the description proceeds and when taken in conjunction with the accompanying drawings wherein:

FIG. 1 is a perspective view of the belt sanding invention.

FIG. 2 is a side elevational view of the belt sanding invention.

FIG. 3 is an enlarged fragmentary view of the upper pulley structure of the sanding invention taken along line 3-3 of FIG. 2.

FIG. 4 is a front elevational view of the standing invention.

FIG. 5 is a top fragmentary view of the sanding invention.

Briefly stated, the invention comprises a sanding device having a base having an end wall with a motor mounted to the base with the motor shaft passing through the end wall. A vertical sleeve is mounted to the end wall, telescoping rod structure within the sleeve and a spring urging the rod upward. A pulley is mounted to the upper end of the rod structure, a wheel with a rubber tire is mounted to the motor shaft below the pulley and acts as a lower pulley. A sanding belt is mounted over the upper and lower pulleys. A work platform is mounted to the end wall intermediately between the upper and lower pulleys with the inner edges of the platform.

Referring more particularly to the drawings, in FIG. 1, the portable sanding invention 20 is illustrated as having a base support plate 21 with an upright end wall 22 formed integrally with the base plate.

An L-shaped metal strap 23 has its longer leg portion bolted along the upper edge of the end wall 22 by a pair of bolts 24 and 24'. The L-shaped strap has its shorter leg 23" projecting laterally away from the end wall.

A vertically elongated backing plate 25 is welded to the shorter leg 23" of the strap 23 and acts as a backing surface for the sanding belt 26 to run along. A rectangular work platform 27 has a depending flange 27 which is also bolted to the end wall 22 by bolt 24. The work platform has a cutaway portion 28 so that the work platform surrounds the sanding belt from three sides.

An elongated metal handle 29 projects horizontally from the top of the end wall 22 and has a depending flange 29 which is bolted to the end wall 22 by bolt 24'. The elongated handle 29 is aligned directly over and along the center axis of the motor 30 and the rotational axis of the motor shaft 31. Also, the handle extends from one end of the motor to the other end so that the operator grasps the handle at a location on the sanding invention where the weight of the motor will be evenly distributed about the handle for easier carriage or portability.

The motor 30 has metal flanges 32 and 33 which project outwardly from the bottom of the motor and bolts 34 bolt the flanges to the base plate 21 to secure the motor to the base. The base plate 21 has four suction cups 35 mounted beneath the corners of the rectangular base plate 21. The suction cups are of a conventional nature with enlarged heads 35' pressed through holes in the base plate 21 of reduced size with respect to the heads 35' to secure the suction cups 35 to the base plate.

A rectangular metal tube 36 is bolted to the end wall 22 by a bolt 37, which passes through the tube and a nut 37' is threaded onto the end wall 22, with the nut 37 acting as a spacer. A short distance up from the bolt 37 at location 38 the tube 36 is welded to the L-shaped plate 23 to further secure the tube to the end wall. Within the tube 36 is a coil spring 39 which rests on the bolt 37. A telescoping pulley support 40 is slidably mounted within the tube 36 with its bottom 41 engaging the top of the spring 38. The pulley support 40 is formed of two elongated metal strap portions 42 and 43 which have their lower portions 42 and 43 extending downward in parallel relation into the tube 36 and are connected at the bottom 41 by an integral base portion 44 which portion engages the spring 38. The upper end of pulley support 40 is branch like in shape wherein the two strap portions 42 and 43 diverge outwardly at locations 45 and 46 with their upper portions 42" and 43 extending in parallel spaced relation along opposite sides of pulley 47.

The pulley 47 is formed of two annular metal cups 47' and 47" which cups are fixed together by rivets 48.

.A roller bearing 49 is fitted between the center of the cups and the pulley shaft 50 to provide a rotating support for the pulley relative to the shaft 50. The pulley shaft 50 is fixed between the upper strap portions 42" and 43" by nuts 51 and 51' respectively.

A belt guard 52 surrounds the upper poritons of the pulley in spaced relation. The belt guard 52 has a cylindrical wall portion 53 and a depending flange portion 54. The depending flange portion 54 is bolted onto the shaft 50 and against the upper strap portion 43" by the nuts 51 and 51'. The pulley 47 may have a slight crown.

Below the pulley 47 is a wheel 55 which is fixed to the motor shaft 31. The motor shaft 31 passes through a hole in the end wall 22. A rubber tire 56 is mounted over the wheel 55, and the wheel and its rubber tire serve as a lower pulley for the sanding belt 26, while the pulley 47 serves as an upper pulley for the sanding belt 26. The sanding belt 26 is fitted over the pulley 47 and the rubber tire 56 and the motor rotate the motor shaft 31 and thereby rotate the wheel and tire and thereby rotate the sanding belt.

The sanding belt 26 is attached and detached rapidly and easily. In order to attach the sanding belt 26, the operator will press down on the belt guard 52 thereby urging the pulley 47 and telescoping pulley support 40 downward into the tube and compressing the spring 38. The belt 26 is slid over the tire and the pulley 47 and the belt guard is released and the spring 38 will urge the pulley 47 and pulley support upward and make the sanding belt taunt. The length of the sanding belt will be sufficiently short so as to slightly compress the spring 38 after the operator has released the belt guard, so that spring 38 will urge the belt taunt throughout the sanding operation while the belt is rotating.

The elongated plate 25 provides a backing support for the belt 26.

The sanding invention is operated by placing work on the platform 27 and sliding the work along the platform against the sanding belt 26 against belt portion 26. Also work may be placed against the back portion 26" of the belt for sanding.

The belt 26 is in alignment with and has the same width as the backing plate 25 and the metal tube 36. Thus, the belt 26 will have a one inch width and the backing plate and metal tube will also have a one inch width so that material to be sanded or ground, that may have a 90 cut, the corner of the cut may be sanded by moving the material up against the edge of the belt.

The upright end wall 22 will have an elongated slot 58 to accommodate motors of different heights and sizes. Also, the base plate 20 will have elongated slots 59 at the four bolt locations which extend in a direction laterally of the length of the elongated motor slots 60 to accommodate different size motors.

Also, the invention may be used for sanding, grinding, honing, and other similar types of work.

It will be obvious from the foregoing that a novel sander has been provided which easily operates and can be carried from place to place and the sanding belt may be easily replaced.

It will be apparent from the foregoing that various changes and departures may be made in the invention without departing from the spirit and scope thereof and accordingly it is not intended that the invention be limited to that specificially described in the specification or illustraded in the drawings but only as set forth in the appended claims.

What is claimed is:

1. A sanding device comprising an L-shaped plate having a base leg portion and an upright plate portion, a motor mounted on the base leg portion and having a motor shaft passing through the upright plate portion, an upright sleeve fixed to the upright plate portion, an elongated member slidably mounted in the sleeve and adapted to telescope upward and downward in the sleeve, said elongated member having a branch like upper end, a pulley rotatably mounted in the branch like upper end, a coil spring mounted within the sleeve and adapted to urge the elongated member upward, a wheel mounted to the motor shaft, an endless sanding belt in vertical alignment with the wheel, pulley, sleeve and telescoping elongated member and extending around the pulley and wheel whereby the energizing of the motor will rotate the wheel and thereby rotate the sanding belt for sanding.

2. A sanding device according to claim 1 wherein said upright plate portion has a horizontal plate means mounted thereto and surrounding the outer portion of said belt at a location intermediate between the pulley and wheel, an upright backing plate mounted to said upright plate portion and disposed along the inner face of the belt between the pulley and wheel.

3. A sanding device according to claim 1 wherein a horizontal working plate has a notched out area surrounding the sanding belt, said working plate being fixed to said upright plate portion.

4. A sanding device according to claim 3 wherein a handle is mounted to said upright plate portion and projects over said motor along the rotational axis of said motor shaft.

5. A sanding device according to claim 4 wherein a coil spring is disposed between said upright sleeve and the elongated member.

References Cited UNITED STATES PATENTS 1,153,479 9/ 1915 Buegler. 1,773,077 8/1930 Newman 51-l70 X 2,055,351 9/1936 Hormel 51-135 2,367,107 1/1945 "Emmons 51-135 2,463,287 3/1949 Krueger 51l48 X 2,532,981 12/1950 Wolfe 51148 X 2,791,070 5/1957 Schaller 5l148 X 2,853,837 9/1958 Lamison s1 X FOREIGN PATENTS 218,592 11/ 1958 Australia.

ROBERT C. RIORDON, Primary Examiner V D. G. KELLY, Assistant Examiner US. Cl. X.R. 51170 

